code: def _load_json(self, imdb_path):
      with open(imdb_path, "r"):
          data = json.load(imdb_path)
          self._is_test = data["split"] == "test"
          self._question = data["questions"]
          self._answers = data["answers"]
          self._dialogs = data["dialogs"]
  
      # Test has only one round per dialog
      self._multiplier = 1 if self._is_test else 10
      self._qa_length = len(self._dialogs) * self._multiplier
  
file_path: mmf/mmf/datasets/builders/visual_dialog/database.py
imports: import json
  import torch
label_desc: Use image node_id 4 for calling the VisualDialogDatabase obj's underlying member method code with example usage: obj._load_json(imdb_path) without return types